The keys are based on the contrasting characters generally in a pair called:

Assertion $\left(\mathrm{A}\right)$: Herbariums are plant repositories which are used as reference specimens. Recently these are digitalized for global use.

Reason $\left(\mathrm{R}\right):$ Herbarium helps in the classification of plants and gives complete description about the taxonomy.

The correct answer is:

The correct answer is

Assertion: Species is an ecological unit.

Reason: Individuals of a species share the same ecological niche.

The correct sequence of the taxonomic hierarchy is

a. Genus $\to$ Family $\to$ Class $\to$ Order Phylum $\to$ Kingdom $\to$ Species

b. Species $\to$ Genus $\to$ Family $\to$ Order $\to$ Class $\to$ Phylum $\to$ Kingdom

c. Species $\to$ Family $\to$ Genus $\to$ Kingdom $\to$ Order $\to$ Class $\to$ Phylum

d. Species $\to$ Genus $\to$ Family $\to$ Class $\to$ Order Phylum $\to$ Kingdom

Assertion $\left(\mathrm{A}\right)$: Sub species shows minor variations from parent population

Reason $\left(\mathrm{R}\right)$: Sub species is reproductively isolated population of a species

Match the following

The correct answer is

Match the following

The correct answer is